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Lubricants
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Advances in Hydrodynamic Bearings
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Advances in Hydrodynamic Bearings

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 31 May 2026 | Viewed by 1959

Special Issue Editors

Dr. Michael Pusterhofer

E-Mail Website
Guest Editor
Chair for Mechanical Engineering, Montanuniversität Leoben, 8700 Leoben, Austria
Interests: mechanical engineering; tribology; EHD simulation; gear tribology; bearing tribology; sliding contacts
Prof. Dr. Wassim Habchi

E-Mail Website
Guest Editor
Department of Industrial and Mechanical Engineering, School of Engineering, Byblos Campus, Lebanese American University, Byblos, Lebanon
Interests: tribology; elastohydrodynamic lubrication; finite elements; machine learning
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Lubrication is a key element in allowing machinery to operate with low energy losses and minimal wear. Since the first investigation of the hydrodynamic effect in journal bearings by Tower and Reynolds, significant progress has been made. The benefits of full-film lubrication have led to its widespread use in machinery of many different types.

Today, full-film lubrication faces new challenges: low-viscosity oils or even water as lubricants, more complex rheological behaviors than those described by the standard Newtonian model, artificial surface textures to enhance load-carrying capacity, and the need for more accurate consideration of surface roughness and texture in numerical models.

The scope of this Special Issue includes, but is not limited to, the following topics:

  • Experimental testing of journal or thrust bearings
  • Numerical modeling of hydrodynamic or hydrostatic lubrication
  • Research around artificial surface texture–numerical or experimental
  • Rheological impacts on full-film lubrication properties
  • Impact of surface roughness on the full-film lubrication, e.g., flow factors
  • Water-lubricated bearings
  • Ultra-low-viscosity oils and their impact on full-film lubrication
  • Oil aging and the corresponding effects on bearing capacity under full-film lubrication

Dr. Michael Pusterhofer
Prof. Dr. Wassim Habchi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • full-film lubrication
  • rheology
  • hydrodynamic theory
  • elastohydrodynamics
  • artifical surface textures
  • surface roughness
  • journal bearing
  • thrust bearing
  • viscosity
  • oil aging
  • water-lubricated bearings

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

27 pages, 5347 KB  
Article
CFD-Based Analysis of Loading Performance and Hydrodynamic Effects in a Partial-Arc Aerostatic Radial Bearing
by Ruiran Ma, Jiashuo Zhang, Ming Feng, Zhixin Jia and Jin Wang
Lubricants 2026, 14(4), 156; https://doi.org/10.3390/lubricants14040156 - 5 Apr 2026
Viewed by 343
Abstract
With the widespread use of high-speed motorized spindles in precision machining, conventional contact loading methods are no longer adequate for stiffness loading tests under high-speed operating conditions. Non-contact loading technology based on a partial-arc aerostatic radial bearing offers an effective alternative. In this [...] Read more.
With the widespread use of high-speed motorized spindles in precision machining, conventional contact loading methods are no longer adequate for stiffness loading tests under high-speed operating conditions. Non-contact loading technology based on a partial-arc aerostatic radial bearing offers an effective alternative. In this study, a CFD-based hydrodynamic model was developed for the gas-film flow field in a partial-arc aerostatic radial bearing. The effects of bearing geometric parameters, such as chamber configuration, supply-orifice structure, and eccentricity, on loading characteristics were investigated. The influence of hydrodynamic effects under high-speed rotation on the loading force stability and stiffness-testing accuracy was analyzed, and an asymmetric shallow–deep composite chamber design was proposed to mitigate these effects. The results indicate that the partial-arc aerostatic radial bearing, designed based on both static characteristics and rotational performance analysis, can effectively suppress hydrodynamic effects and improve loading force stability and stiffness-testing accuracy. Full article
(This article belongs to the Special Issue Advances in Hydrodynamic Bearings)
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23 pages, 2882 KB  
Article
The Influence of Misalignment on the Performance of the Herringbone Groove Journal Bearing-Rotor System
by Yubin Zhang, Fengtao Wang, Chunlan Yu, Huomei Zhu and Xiaoyun Zhao
Lubricants 2026, 14(2), 79; https://doi.org/10.3390/lubricants14020079 - 10 Feb 2026
Viewed by 544
Abstract
Misalignment of the herringbone groove radial bearing can lead to changes in performance and system abnormalities. To investigate the effects of different misalignment modes and magnitudes on the HGJB-rotor system, a coupled dynamic model was established. Based on this model, the influences of [...] Read more.
Misalignment of the herringbone groove radial bearing can lead to changes in performance and system abnormalities. To investigate the effects of different misalignment modes and magnitudes on the HGJB-rotor system, a coupled dynamic model was established. Based on this model, the influences of parallel misalignment and angular misalignment on bearing performance were analyzed, and the variation law of rotor vibration was revealed. The results indicate that the rotor motion trajectory and bearing dynamic coefficients (including critical journal mass and critical whirl frequency) exhibit time-varying characteristics. Specifically, compared with the aligned condition, a parallel misalignment of δ = 8.0 × 10−6 m reduces the relative film thickness by 17.8% and increases the maximum film pressure by 1.85%. Meanwhile, an angular misalignment of θ0 = 8.0 × 10−4 rad results in a 45.9% reduction in relative film thickness and a 33.1% increase in maximum film pressure. Additionally, the increased misalignment magnitude enhances the rotor vibration amplitude significantly. For instance, the Y-direction displacement amplitude increases by 59.4% under the maximum parallel misalignment. Moreover, the misalignment also alters the axial trajectory of the rotor. Overall, different misalignment modes and magnitudes exert significant effects on the rotor vibration characteristics. The research findings provide theoretical support and technical references for the further development and engineering application of HGJBs. Full article
(This article belongs to the Special Issue Advances in Hydrodynamic Bearings)
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18 pages, 9942 KB  
Article
Experimental Investigation of a Highly Loaded Half-Journal Bearing
by James Layton, Humberto Medina, Hasna Fadhila, Benjamin C. Rothwell, Stephen Ambrose, Katrina Farbrother and Carol Eastwick
Lubricants 2026, 14(2), 76; https://doi.org/10.3390/lubricants14020076 - 6 Feb 2026
Viewed by 586
Abstract
A dedicated experimental rig is presented for a half-journal bearing operating under highly loaded, well-controlled hydrodynamic lubrication conditions relevant to turbomachinery. The apparatus combines pressure measurements in the film, distributed temperature measurements in the shaft and bush, and ultrasonic film-thickness measurements that map [...] Read more.
A dedicated experimental rig is presented for a half-journal bearing operating under highly loaded, well-controlled hydrodynamic lubrication conditions relevant to turbomachinery. The apparatus combines pressure measurements in the film, distributed temperature measurements in the shaft and bush, and ultrasonic film-thickness measurements that map the circumferential film-thickness profile across the lubrication region. Experiments are reported for normal loads of 5–20 kN and shaft speeds of 1000–4000 rpm with controlled oil supply conditions. The measured pressure and temperature trends are consistent with established hydrodynamic lubrication behaviour. The film thickness measurements confirm full-film operation across the tested operating envelope, while indicating increased uncertainty in regions affected by cavitation. A correlation for the temperature rise due to viscous heating is proposed as a compact representation of the data. The rig design and accompanying measurements provide a benchmark-quality data set intended for validation and development of thermal elasto-hydrodynamic lubrication (TEHL)/computational fluid dynamics (CFD) models under high load and speed conditions. Full article
(This article belongs to the Special Issue Advances in Hydrodynamic Bearings)
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